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dynamicmux.go
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dynamicmux.go
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/*
* Copyright (c) 2017, MegaEase
* All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package api
import (
"net/http"
"sort"
"sync/atomic"
"github.com/go-chi/chi/v5"
"github.com/go-chi/chi/v5/middleware"
"github.com/megaease/easegress/pkg/logger"
)
type (
dynamicMux struct {
server *Server
done chan struct{}
router atomic.Value
}
)
func newDynamicMux(server *Server) *dynamicMux {
m := &dynamicMux{
server: server,
done: make(chan struct{}),
}
m.router.Store(chi.NewRouter())
go m.run()
return m
}
func (m *dynamicMux) ServeHTTP(w http.ResponseWriter, r *http.Request) {
m.router.Load().(*chi.Mux).ServeHTTP(w, r)
}
func (m *dynamicMux) run() {
for {
select {
case <-m.done:
return
case <-apisChangeChan:
m.reloadAPIs()
}
}
}
func (m *dynamicMux) reloadAPIs() {
apisMutex.Lock()
defer apisMutex.Unlock()
apiGroups := make([]*Group, 0, len(apis))
for _, group := range apis {
apiGroups = append(apiGroups, group)
}
sort.Sort(apisByOrder(apiGroups))
router := chi.NewMux()
router.Use(middleware.StripSlashes)
router.Use(m.newAPILogger)
router.Use(m.newConfigVersionAttacher)
router.Use(m.newRecoverer)
for _, apiGroup := range apiGroups {
for _, api := range apiGroup.Entries {
path := APIPrefix + api.Path
switch api.Method {
case "GET":
router.Get(path, api.Handler)
case "HEAD":
router.Head(path, api.Handler)
case "PUT":
router.Put(path, api.Handler)
case "POST":
router.Post(path, api.Handler)
case "PATCH":
router.Patch(path, api.Handler)
case "DELETE":
router.Delete(path, api.Handler)
case "CONNECT":
router.Connect(path, api.Handler)
case "OPTIONS":
router.Options(path, api.Handler)
case "TRACE":
router.Trace(path, api.Handler)
default:
logger.Errorf("BUG: group %s unsupported method: %s",
apiGroup.Group, api.Method)
}
}
}
m.router.Store(router)
}
func (m *dynamicMux) close() {
close(m.done)
}